Core 2 is included in the React SDK starting with version 5. This new version ships with an improved design and UX for its built-in components, no "flash of white page" when authenticating, and a variety of smaller DX improvements and housekeeping items. Each of the potentially breaking changes are detailed in this guide, below.

By the end of this guide, you’ll have successfully upgraded your React project to use `@clerk/clerk-react` v5. You’ll learn how to update your dependencies, resolve breaking changes, and find deprecations. Step-by-step instructions will lead you through the process.
